Our mineral reserves

Bibliographic data

Monograph

Identifikator:: 867029366

URN:: urn:nbn:de:zbw-retromon-93011

Document type:: Monograph

Author:: Smith, George Otis http://d-nb.info/gnd/117634530

Title:: Our mineral reserves

Place of publication:: Washington, DC

Publisher:: Gov. Print. Off.

Year of publication:: 1914

Scope:: 1 Online-Ressource (48 Seiten)

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

42 OUE MINERAL RESERVES. owing to the distance the mineral must be hauled to a railroad, while smaller mines close to railroad stations are being worked. For certain purposes magnesite is used raw, and for other purposes it is calcined, and the imports include both kinds. As in the manu facture of cement, for example, freshly calcined magnesite seems to be superior to old calcined material, there would seem to be a field for more extensive calcining and grinding in our own country, entirely irrespective of the source of the material. FLUORSPAR. The fluorspar industry of the United States has shown a steady growth from a production of 4,000 short tons in 1884 to 115,580 tons, valued at $736,286, in 1913. This notable gain has been conditioned largely by the growth of the open-hearth process of steel manufac ture, which absorbs about 80 per cent of the fluorspar produced. Fluorspar is used also as a flux in blast furnaces, iron foundries, and silver, copper, and lead smelters; in the manufacture of fluorides of iron and manganese for steel fluxing; in the manufacture of glass, enameled, and sanitary ware and of hydrofluoric acid; in the pro duction of aluminum ; in the electrolytic refining of antimony and lead ; and for many other purposes. The increase in the home production and the imposition of a tariff on fluorspar in 1909 have resulted in a marked decrease in the amount brought in from foreign countries, and in 1913 only 22,682 short tons was imported, compared with the 115,580 tons produced at home. The imports come almost entirely from Great Britain and amount to over 55 per cent of the total English production of this mineral. The English product entering at New York is able to com pete with domestic " spar ” as far west as Pittsburgh. There can be no question of the adequacy of the American supply to meet all demands in case the English supply is cut off. In 1913 the output came from Illinois, Kentucky, New Mexico, Colorado, New Hampshire, and Arizona, named in the order of yield. Fur thermore, the foreign spar is of lower grade than the mechanically treated spar from Illinois and Kentucky, and as fluorspar is of value chiefly according to its purity, purchasers find that the purer Ameri can spar is more efficient and consequently cheaper in the end. STRONTIUM. The Geological Survey has received in the last few weeks inquiries regarding American occurrences of strontium minerals. Many of the domestic occurrences are of minor extent and most of them are of little commercial value under ordinary conditions. The two strontium minerals of commercial importance are celestite (SrSO,)

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